Changing Read/Write Permissions

Scenarios

• Read-only

  If Read-only is selected, data in the DB instance cannot be modified anymore. You can set Read/Write Permissions to Read-only even for a DB instance that is already read-only due to full storage. In this case, after the instance becomes available, it is still read-only.

• Read/write

  If Read/write is selected, the DB instance becomes readable and writable. You can set Read/Write Permissions to Read/write even for a DB instance that is read-only due to full storage. In this case, only after the instance becomes available, it is readable and writable.

Constraints

• This function is only available for single and primary/standby DB instances.
• Read/write permissions cannot be changed when the instance is in any of the following statuses: creating, changing instance class, frozen, or abnormal.
• This function is available for open beta testing (OBT) in some regions. If this function is not available in your region, contact customer service to request permissions.

Precautions

• Before setting Read/Write Permissions to Read-only, to ensure data consistency, ensure that no data is being written to the database.
• If the DB instance is abnormal (except when the storage is full), it cannot be set to read-only.
• If your instance is set to read-only, you can still perform operations on the Accounts and Databases pages on the console.
• If your instance is set to read-only, non-administrator users cannot write data to it anymore. When your instance is processing large transactions or DDL requests, changing it to read-only may fail due to timeout.
• If your RDS instance is associated with a DDM instance, changing it to read-only will affect DDM instance functions.
• If you have selected Read/write but the DB instance is still read-only, check whether the DB instance is involved in an ongoing DRS migration task or if the instance storage is full.
• If your instance becomes read-only for other reasons (such as full storage and DRS migration), it cannot be changed to readable and writable by setting Read/Write Permissions to Read/write.
• This function configures read/write permissions only for primary DB instances.

Procedure

1. Log in to the management console.
2. Click in the upper left corner and select a region and a project.
3. Click Service List. Under Database, click Relational Database Service.
4. On the Instances page, click the instance name.
5. In the DB Information area on the Basic Information page, click Change next to the Read/Write Permissions field. In the displayed dialog box, select Read-only or Read/write as required and click OK.